Go to this link and look at design ideas
Fold and Fly Paper Planes
There are step by step instructions.
There is also a 'how to build' hand on video at the bottom of the page.
There are also some Youtube videos to watch for building more superior paper planes.
1/. Flies over 1000ft (305 meters)
2/. How to make the world record plane
3/. How to make a paper come back
4/. How to make a world record paper plane
Then when you have built (created) your first plane, you need to fly it. There maybe changes to be made to the design. Fix or rebuild it.
Then build a more challenging plane.